A New Class of Synthetic Jet Actuators—Part I: Design, Fabrication and Bench Top Characterization

Gilarranz, J. L.; Traub, Lance W.; Rediniotis, Othon K.

doi:10.1115/1.1839931

Cited by 58 publications

(29 citation statements)

References 21 publications

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“…(5) Initially, the modeling of the pumping by the actuating pump was considered because the energy for the entire system is provided by actuating the piezo stack. Eqs.…”

Section: Mathematical Modelingmentioning

confidence: 99%

“…John et al [2] also studied the parameter of the pump for the maximum actuating velocity by investigating the internal flow distribution of the micro pump. Furthermore, a fluidic diode was designed and tested for a hybrid jet actuator [3], and design optimization and fabrication of jet actuators were performed for flow separation control [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Study on flow distribution inside integrated hybrid actuator

et al. 2014

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A piezoelectric-based hydraulic actuator is a type of piston-cylinder device which is operated by internal flow energy. Recently, an artificial muscle and a micro actuator have been developed using a new smart material and internal flow control. Thus, the actuating velocity of the fabricated integrated hybrid system was investigated using the pumping frequency and load weight. The actuating velocity was then calculated using a developed program, and the numerical result was compared with the experimental result to validate the numerical program. Also, the internal flow rate was measured to analyze the pump efficiency experimentally. The flow rate inside the integrated hybrid actuator calculated using a CFD program for various pumping frequencies was then compared with the experimental results. The maximum outlet velocity was obtained at the pumping frequency of 35 Hz and the velocity decreased from that point due to flow loss.

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“…(5) Initially, the modeling of the pumping by the actuating pump was considered because the energy for the entire system is provided by actuating the piezo stack. Eqs.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on flow distribution inside integrated hybrid actuator

et al. 2014

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“…Zha et al [16] also employed this method to investigate its viability when the aerofoils are in high performance. Gilarranz et al [17] initiated a method for controlling flow around bodies, which was later experimentally applied to NACA 0015 aerofoil [18]. You and Moin [19] also performed a Large-Eddy Simulation (LES) in order to control the flow around a NACA 0015 aerofoil and further verified their simulation by comparing their results against experimental measurements by Gilarranz et al [18].…”

Section: Introductionmentioning

confidence: 97%

Effects of Boundary Layer Control Method on Hydrodynamic Characteristics and Tip Vortex Creation of a Hydrofoil

Ghadimi

Tanha

Kourabbasloo

et al. 2017

Polish Maritime Research

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There is currently a significant focus on using boundary layer control (BLC) approach for controlling the flow around bodies, especially the foil sections. In marine engineering this is done with the hope of increasing the lift -to -drag ratio and efficiency of the hydrofoils. In this paper, effects of the method on hydrodynamic characteristics and tip vortex formation of a hydrofoil are studied. Steady water injection at the tip of the hydrofoil is simulated in different conditions by using ANSYS-CFX commercial software. Validity of the proposed simulations is verified by comparing the obtained results against available experimental data. Effects of the injection on the lift, drag, and lift -to -dragratio are studied and the ranges within which the injection has the most positive or negative effects, are determined. Furthermore, flow pattern and pressure variation are studied upon the water injection to determine the most positive and negative case and to ascertain the main reasons triggering these phenomena.

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“…There are definitions that use a different characteristic velocity of the jet. Examples are the peak velocity at the centerline [51], or the root-mean-square value of the velocity at the centerline [52]. Additionally, a momentum coefficient directly based on time-averaging the added momentum during the ejection part of the cycle is also used [53].…”

Section: Parametersmentioning

confidence: 99%

“…Actuators can be either based on piezoceramic composite diaphragms [53,34], voice-coils (speakers) [53,62], or pistons [51].…”

Section: Actuatorsmentioning

confidence: 99%

On synthetic jet actuation for aerodynamic load control

Vries¹

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SummaryA major goal for the wind energy industry is the reduction of the cost of energy. This drives the design towards increasingly larger wind turbines. The technology of smart rotor control is expected to allow wind turbines to increase even further in size. Smart rotor control consists of a sequence of local load control mechanisms, distributed along the span of a wind turbine blade, which are operated individually based on local sensory information. This technology has the potential to reduce fatigue inducing variations in blade loads.Fatigue loads are induced by cyclic effects, such as wind shear, gravity and yaw misalignment, or by stochastic effects, such as turbulence in the upstream flow. Alleviation of the fatigue loads reduces the structural requirements of multiple components of a wind turbine, which allows for relatively lighter structures and less maintenance. It is expected that this will decrease the cost of energy, due to a combination of increased energy production and relatively lower capital and maintenance costs of a large but lighter wind turbine equipped with smart rotor control.The aerodynamic effect needed for smart rotor control is 'local pitch control', which aims for changes in the local aerodynamic characteristics, mainly the lift coefficient (c l ), over the range of angles of attack (α) in the linear c l (α)-regime. This aerodynamic effect can also be employed for other turbomachinery and in wing aerodynamics in the field of aeronautics. Potential options for local pitch control are trailing edge flaps, micro-tabs (small deployable Gurney flaps) and blade morphing. Active fluidic control close to the trailing edge by means of jets is an alternative option.In the present research, synthetic jets have been investigated as a potential option for local pitch control. Synthetic jets are generated by repeated ingestion and subsequent ejection of air, into and out of a cavity below the surface of the blade, respectively, through holes or slits in the surface of this blade. This oscillatory ejection/ingestion is caused by a vibrating wall inside the cavity, such as a piston or a piezoceramic composite diaphragm. The technology of synthetic jets can be used for boundary layer separation control, as well as pitch control.In the present thesis, a multi-purpose computational method has been developed for the simulation of unsteady compressible viscous flows. This method is, in principle, able to address the relevant characteristic flow effects associated with synthetic jet actuation. The computational method solves the unsteady Reynolds-averaged Navier-Stokes (URANS) equations for unsteady compressible viscous flow, together with the equation(s) of a linear eddy-viscosity turbulence model. The equations are discretized on unstructured computational grids, employing the Finite Volume method on cell-centered control volumes. The discretization is nominally of second order accuracy, both in space and time.iii An exception is the discretization of the convective flux in the equation(s) of the tur...

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A New Class of Synthetic Jet Actuators—Part I: Design, Fabrication and Bench Top Characterization

Cited by 58 publications

References 21 publications

Study on flow distribution inside integrated hybrid actuator

Study on flow distribution inside integrated hybrid actuator

Effects of Boundary Layer Control Method on Hydrodynamic Characteristics and Tip Vortex Creation of a Hydrofoil

On synthetic jet actuation for aerodynamic load control

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